Tuck-creaser or tucker for sewing-machines.



L. M. FORD. TUGK GREASER OR TUGKBR FOR SEWING MACHINES.

APPLICATION FILED 001. 1a, 1911.

1,037,608 Patented Sept. 3, 1912.

COLUMBIA PLQNOURAPHICOQWASHINGTON D c LOUIS M. roan, or

NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE GREIST MANUFAC- TURING COMPANY, A CORPORATION OF CONNECTICUT.

TUCK-CREASER on ruoxnn FOR snwine-nacnrnns.

Specification of Letters Patent.

Patented Sept. 3, 1912.

Application filed October 18, 1911. Serial No. 655,409.

To all whom it may concern citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented or discovered certain new and useful Improve ments in Tuck-Creasers or Tuckers for SewingMachines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to an improvement in sewing machine truck creasers or tuckers, and in the operation of which the goods are creased while one tuck is being stitched, to indicate the line of fold for the next succeeding tuck; and the invention has for its object to obviate a tendency of the goods to pull away from the guide, in certain kinds of work and on certain machines, and which tendency is liable to result in the formation of imperfect work or in the formation of crooked seams. Thus when the tucker is employed for making narrow tucks, without any space between them, in forming the second, third, and all succeeding tucks, the last tuck made would be passing under the left part of the presser-foot portion of the tucker while the new tuck would be passing under the right hand portion of said presser-foot, and in such case there will be two thicknesses of goods beneath the presser-foot at the right side of the needle, and four thicknesses of goods, where the tuck last made overlaps the new tuck, at the left side of the needle. In doing this class of work on certain kinds of sewing machines, as in most vibrating shuttle sewing machines, in which the pull-off of the needle thread from the shuttle is toward the right, there is a tendency to draw the goods, against the guide, which is to the right of the tuck being formed, so that it is not necessary that the presser-foot should overlap the left portion of a divided feed dog; but in other kinds of sewing machines, in which the pull-olf of the shuttle thread is toward the left, there is a tendency, in the tuck-forming operation, for the goods to draw toward the left, away from the guide, particularly when sewing on thin materal, and it is therefore desirable, in tuckers which are to be used in this last-named class of sewing machines, that the left portion of the resser-foot of the tucker should rest upon the left part of a divided feed dog. But with the presser-foot thus resting on two or more portions of the feed dog, and with four thicknesses of material under the left part of the presser-foot, and only two thicknesses of material beneath the right part thereof, the tendency of the work to draw to the left away from the guide is increased.

The present invention has for its object to obviate this difficulty by making the left portion of the resser-foot part of the tucker in the form of a spring-pressed section which may yield upwardly, independently of the main or rigid portion of the presser-foot, and thereby compensate for the uneven thickness of the work beneath the presser-foot, so that the work will run straight without special care on the part of the attendant.

In the accompanying drawings Figure 1 is a perspective view of a sewing machine tuck creaser or tucker embodying the present invention. Fig. 2 is a plan view of the presser-foot part of the tucker showing a divided feed dog partly in dotted lines, and Fig. 3 is a vertical cross section of the said presser-foot part and of the feed dog, on the line 3-8, Fig. 2. Fig. 4 is a bottom view of the presser-foot and frame portion of the tucker.

The tuck creaser or tucker illustrated in the accompanying drawing, and to which the present invention is shown as being applied, is essentially the same as that shown and described in U. S. Patent No. 928,838, dated July 20, 1909; but it will be understood that the present invention may be applied to other forms of tuck creasers or tuckers than that herein shown.

In the device herein illustrated, 12 denotes the shank portion of the presser-foot adapted for attachment to the presser-bar of a sewing machine, and 13 denotes the main or wide rigid presser-foot part of the tuck creaser or tucker, and with which presserfoot part the frame or supporting portion 14 of the attachment is preferably formed integral, as in the tucker of the patent above referred to.

The tuck creasing devices comprise an up wardly projecting creasing lip 15, over which the goods pass, and which is formed at the end of a plate 16, the said creasing lip being overlapped by a vibrating plate 17 having on its underside a small notch which registers with the lip 15. The plate 17 is forced downward, at each downward movement of the needle-bar, by an arm 18 receiving downward pressure from a lever 19 which is arranged to be engaged bv a pin or rollerstud on the needle-bar of the machine. The folded tuck to be stitched is guided to the stitch-forming devices by means of an edgeguide 20 carried by a laterally adjustable plate 21, so as to provide for forming tucks of different widths, as is usual in devices of this kind.

Cooperating with the main or wide rigid portion 13 of the presser-foot is a narrow yielding presser-foot section 22 which, in the form of the invention herein shown, is attached to a thin plate-spring 23 which in turn is secured in any suitable manner to the presser-foot, as by being brazed or riveted to the upper side of said foot so as to overlie the same, as shown. This yielding section 22 of the presser-foot is arranged on the left side of the rigid portion 13 of said presser foot, and is made in the form of a narrow strip of metal extending in the line of the feed of the work, so as to press on that portion of the work overlying the left part of a divided feed dog 24, as will be understood from Fig. 3. Thus in the formation of narrow tucks, with no space between them, the thicker portion of the work, comprising four thicknesses of material, will come beneath the yielding presscr-foot section 22; while the thinner portion ofthe work, comprising two thicknesses of mate rial, will come beneath the rigid part 13 of the presser-foot, and the tendency of the increased pressure of the presser-foot upon the thicker portion of the work will thus be compensated for. From this itresults that the tendency of the goods, when forming certain kinds of work on certain sewing machines, to draw away from the edge guide 20 will be compensated for, and the work will be accurately fed to the needle, in a straight line, without special care on the part of the attendant.

The terms right and left as herein employed will be understood to have reference to the right and left hands of an attendant sitting facing the sewing machine or the tuck-creaser as applied thereto in use.

Having thus described my invention I claim and desire to secure by Letters Patent:

1. In a sewing machine tuck creaser tucker,

or the combination with creasing members and an edge guide, of a presser footconsisting of a relatively wide main rigid portion and a relatively narrow yielding portion which is a permanent part of said Presser-foot and which is arranged on the left hand side of the said rigid portion and is adapted to yield upwardly to compensate for different thicknesses of material beneath said presser-foot.

2. In a sewing machine tuck creaser or tucker, the combination with creasing mem bers and an edge guide, of a Presser-foot consisting of a relatively wide main rigid portion and a relatively narrow yielding portion on the left side of said main portion, and a plate-spring to which said yielding portion is attached and which spring is permanently secured to and overlies said main portion of said presser-foot.

In testimony whereof I affix my signature, in presence of two witnesses.

LOUIS M. FORD. Witnesses H. M. GREIsT, H. B. DARTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. M

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